Agreed- you shouldn't need to carb load, and during the race, at most take a gel at about 10 miles- if you get a caffeine one, it will give you a boost- although it is likely to be more psychological than anything. ( Don't try this in the race for the first time- they can upset some folk's stomachs)
What aort of time are you aiming for? I only ask because a half is a print for those at the faster end, wheres if you are going to be a good bit over 2hrs you might need to eat a bit more as you go.
On race day you'll be flying by the time you get to mile 12!- adrenaline and crowd support are a great cure for tiredness. It's always easier on race day.
I usually run in the mornings- don't feel you need to eat a big brakfast before you go out- lots of us just have a drink and then go- some have coffee- I tend to have a smootihe- one of theless acidic ones- I think its banana, pineaplle and something. I can run after and orange juice, but if Im; doing anythnig at all strenuous, the acidity can affect my stomach.
If I'm out for more than about an hour on an empty stomach, I would have something with me to nibble on, in case I have a "dip" in energy, but it's got less and less of a problem the more I do it.
freddy-I am about your standard, and have also been running for several years, I will not get faster at 5k- (I'm 4 yrs older), but I am getting better at other things...............I suspect that it is difficult to speed up much at this stage, so I concentrate on longer, slower runs, endurance, and runnig ultras.
Unfortunately, if you husband is a naturally fast runner, and is walking a lot in his work, he will improve quickly at first with just minimal traiing.............presumably hr'll then "get the bug", and start to train more.
If I was you, I'd choose a longer distance to race him over!